ASME B16.9 reducer thickness

[TomoB]

Hello,

I am performing a pipe stress analysis for a system and have encountered some confusion regarding the wall thickness of reducers.

After reviewing the ASME B16.9 standard, I found that no specific wall thickness is defined for reducers. I also searched through the forum and learned that, unlike EN standards, there are no standardized wall thickness values for these components.

From my understanding, design of a reducer is determined by the specified wall thickness of the connected pipe, i.e., the wall thickness at the ends of the reducer. However, the wall thickness and design of the reducer body itself are left to the manufacturer's choice, provided they comply with the ASME B31.1 code.

My question is: How can I determine the appropriate values to use for the reducer in my calculations?

Thank you for your time!

 

[LittleInch]

Measure it?

Or use the wt at the larger end of the reducer.

 

[Snickster]

I believe you would just analyze the connecting pipe at wall thickness of the connecting pipe at the connecting pipe wall thickness and at the location of the connections. There is no analysis of the reducer sloping section or stress concentration factor applied to the reducer as far as I can remember.

In Caesar I think it was modeled as a pipe segment with average diameter and wall thickness of the connecting piping but it has been a while since I used Caesar.

 

[goutam_freelance]

Equivalent thickness can be calculated by weighing a sample fitting and applying a suitable geometric formula.

 

[r6155]

See ASME B16.9 2.2 .......fittings may have to be thicker than the pipe wall........